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/* Shared library add-on to iptables to add TOS target support. */
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <getopt.h>
#include <iptables.h>
#include <linux/netfilter_ipv4/ip_tables.h>
#include <linux/netfilter_ipv4/ipt_TOS.h>
struct tosinfo {
struct xt_entry_target t;
struct ipt_tos_target_info tos;
};
/* TOS names and values. */
static const
struct TOS_value
{
unsigned char TOS;
const char *name;
} TOS_values[] = {
{ IPTOS_LOWDELAY, "Minimize-Delay" },
{ IPTOS_THROUGHPUT, "Maximize-Throughput" },
{ IPTOS_RELIABILITY, "Maximize-Reliability" },
{ IPTOS_MINCOST, "Minimize-Cost" },
{ IPTOS_NORMALSVC, "Normal-Service" },
};
/* Function which prints out usage message. */
static void
help(void)
{
unsigned int i;
printf(
"TOS target v%s options:\n"
" --set-tos value Set Type of Service field to one of the\n"
" following numeric or descriptive values:\n",
IPTABLES_VERSION);
for (i = 0; i < sizeof(TOS_values)/sizeof(struct TOS_value);i++)
printf(" %s %u (0x%02x)\n",
TOS_values[i].name,
TOS_values[i].TOS,
TOS_values[i].TOS);
fputc('\n', stdout);
}
static const struct option opts[] = {
{ "set-tos", 1, 0, '1' },
{ 0 }
};
/* Initialize the target. */
static void
init(struct xt_entry_target *t)
{
}
static void
parse_tos(const char *s, struct ipt_tos_target_info *info)
{
unsigned int i, tos;
if (string_to_number(s, 0, 255, &tos) != -1) {
if (tos == IPTOS_LOWDELAY
|| tos == IPTOS_THROUGHPUT
|| tos == IPTOS_RELIABILITY
|| tos == IPTOS_MINCOST
|| tos == IPTOS_NORMALSVC) {
info->tos = (u_int8_t )tos;
return;
}
} else {
for (i = 0; i<sizeof(TOS_values)/sizeof(struct TOS_value); i++)
if (strcasecmp(s,TOS_values[i].name) == 0) {
info->tos = TOS_values[i].TOS;
return;
}
}
exit_error(PARAMETER_PROBLEM, "Bad TOS value `%s'", s);
}
/* Function which parses command options; returns true if it
ate an option */
static int
parse(int c, char **argv, int invert, unsigned int *flags,
const void *entry,
struct xt_entry_target **target)
{
struct ipt_tos_target_info *tosinfo
= (struct ipt_tos_target_info *)(*target)->data;
switch (c) {
case '1':
if (*flags)
exit_error(PARAMETER_PROBLEM,
"TOS target: Cant specify --set-tos twice");
parse_tos(optarg, tosinfo);
*flags = 1;
break;
default:
return 0;
}
return 1;
}
static void
final_check(unsigned int flags)
{
if (!flags)
exit_error(PARAMETER_PROBLEM,
"TOS target: Parameter --set-tos is required");
}
static void
print_tos(u_int8_t tos, int numeric)
{
unsigned int i;
if (!numeric) {
for (i = 0; i<sizeof(TOS_values)/sizeof(struct TOS_value); i++)
if (TOS_values[i].TOS == tos) {
printf("%s ", TOS_values[i].name);
return;
}
}
printf("0x%02x ", tos);
}
/* Prints out the targinfo. */
static void
print(const void *ip,
const struct xt_entry_target *target,
int numeric)
{
const struct ipt_tos_target_info *tosinfo =
(const struct ipt_tos_target_info *)target->data;
printf("TOS set ");
print_tos(tosinfo->tos, numeric);
}
/* Saves the union ipt_targinfo in parsable form to stdout. */
static void
save(const void *ip, const struct xt_entry_target *target)
{
const struct ipt_tos_target_info *tosinfo =
(const struct ipt_tos_target_info *)target->data;
printf("--set-tos 0x%02x ", tosinfo->tos);
}
static struct iptables_target tos = {
.name = "TOS",
.version = IPTABLES_VERSION,
.size = IPT_ALIGN(sizeof(struct ipt_tos_target_info)),
.userspacesize = IPT_ALIGN(sizeof(struct ipt_tos_target_info)),
.help = &help,
.init = &init,
.parse = &parse,
.final_check = &final_check,
.print = &print,
.save = &save,
.extra_opts = opts
};
void _init(void)
{
register_target(&tos);
}
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